Which of the following is an even function? P Here [.]denotes the g...

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Which of the following is an even function?
P
Here [.]denotes the greatest integer function and \( \mathrm{f} \) is any function.
W
(a) \( [x]-x \)
(b) \( f(x)-f(-x) \)
(c) \( e^{3-2 x} \cdot \tan ^{2} x \)
(d) \( f(x)+f(-x) \)
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